G670L308T25U_技术文档

Global Mixed-mode Technology Inc.

G670/G671

Microprocessor Reset IC

Features

General Description

Precision Monitoring of +3V, +3.3V, and +5V

The G670/G671 are microprocessor (µP) supervisory

circuits used to monitor the power supplies in µP and

digital systems. They provide excellent circuit reliability

and low cost by eliminating external components and

adjustments when used with +5V, +3.3V, +3.0V- pow-

ered circuits.

Power-Supply Voltages

Fully Specified Over Temperature

Available in Three Output Configurations

Push-Pull RESET Output (G670L)

Push-Pull RESET Output (G670H)

Open-Drain RESET Output (G671L)

2ms max Power-On Reset Pulse Width

14µA Supply Current

Guaranteed Reset Valid to V_CC= +1V

Power Supply Transient Immunity

No External Components

These circuits perform a single function: they assert a

reset signal whenever the V_CCsupply voltage declines

below a preset threshold. Reset thresholds suitable for

operation with a variety of supply voltages are avail-

able.

The G671L has an open-drain output stage, while the

G670 have push-pull outputs. The G671L’s open-drain

3-Pin SOT-23,TO-92 and SOT-89 Packages

2% Threshold Accuracy

RESET output requires a pull-up resistor that can be

connected to a voltage higher than V_CC. The G670L

have an active-low RESET output, while the G670H

has an active-high RESET output. The reset com-

parator is designed to ignore fast transients on V_CC,

and the outputs are guaranteed to be in the correct

logic state for V_CCdown to 1V.

Applications

Computers

Controllers

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable / Battery-Powered Equipment

Automotive

Low supply current makes the G670/G671 ideal for

use in portable equipment. The G670/G671 are avail-

able in 3-pin SOT-23, TO-92 and SOT-89 packages.

Pin Configuration

Typical Application

V_CC

3

VCC

*

R_PULL-UP

Top

View

G670/G671

TTooppVVieieww

µP

RESET

(RESET)

INPUT

GND

1

3

2

1

3

2

SOT-89

SOT-23

TO-92

*G671 only

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

1

Global Mixed-mode Technology Inc.

G670/G671

Ordering Information

ORDER NUMBER

(Pb free)

ORDER NUMBER

TEMP. RANGE

OUTPUT TYPE

G670LxxxTDxB

G670HxxxTDxB

G670LxxxT2xUf

G670HxxxT2xUf

G671LxxxT2xUf

G670LxxxT2xUf

G670HxxxT2xUf

G671LxxxT2xUf

G670LxxxT7xUf

G670HxxxT7xUf

G671LxxxT7xUf

-40°C ~ +105°C

Push-Pull Active Low

Push-Pull Active High

Open-Drain

G671LxxxTDxB

G670LxxxT2xU

Push-Pull Active Low

Push-Pull Active High

Open-Drain

G670HxxxT2xU

G671LxxxT2xU

G670LxxxT7xU

Push-Pull Active Low

Push-Pull Active High

Open-Drain

G670HxxxT7xU

G671LxxxT7xU

Note: U : Tape & Reel B: Bag

Order Number Identification

G67XX XXX T7

X

Pin Option

Package Type

Threshold Voltage Option

Part Number

PART NUMBER

THRESHOLD VOLTAGE OPTION

* xxx specifies the threshold voltage.

G670L : Push-Pull Active Low Output

G670H : Push-Pull Active High Output

G671L : Open-Drain Output

e.g. 263 denotes the 2.64V threshold voltage.

PACKAGE TYPE

TD : TO-92

PIN OPTION

1

2

3

1 :RESET

2 :RESET

T2 : SOT-89

GND

V_CC

GND

T7 : SOT-23

RESET

3 : GND

4 : GND

5 : V_CC

V_CC

RESET

V_CC

GND

RESET

6 : V_CC

GND

*RESET for G670H

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

2

Global Mixed-mode Technology Inc.

G670/G671

Selector Guide

TOP MARK

RESET

THRESHOLD (V)

ORDER NUMBER

(Pb free)

OUTPUT TYPE

ORDER NUMBER

TO-92

663G

xx

G671L463TD5U

G671L438TD5U

G671L400TD5U

G671L330TD5U

G671L308TD5U

G671L293TD5U

G671L263TD5U

G670H463TD5U

G670H438TD5U

G670H400TD5U

G670H330TD5U

G670H308TD5U

G670H293TD5U

G670H263TD5U

G670L463TD5U

G670L438TD5U

G670L400TD5U

G670L330TD5U

G670L308TD5U

G670L293TD5U

G671L463TD5Uf

G671L438TD5Uf

G671L400TD5Uf

G671L330TD5Uf

G671L308TD5Uf

G671L293TD5Uf

G671L263TD5Uf

G670H463TD5Uf

G670H438TD5Uf

G670H400TD5Uf

G670H330TD5Uf

G670H308TD5Uf

G670H293TD5Uf

G670H263TD5Uf

G670L463TD5Uf

G670L438TD5Uf

G670L400TD5Uf

G670L330TD5Uf

G670L308TD5Uf

G670L293TD5Uf

G670L263TD5Uf

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

Open-Drain

663F

xx

663E

xx

Open-Drain

663D

xx

Open-Drain

663C

xx

Open-Drain

663B

xx

Open-Drain

662A

xx

Open-Drain

662N

xx

Push-Pull RESET

Push-Pull

662M

xx

662L

xx

662K

xx

662J

xx

662I

xx

662H

xx

662G

xx

662F

xx

Push-Pull

662E

xx

Push-Pull

662D

xx

Push-Pull

662C

xx

Push-Pull

662B

xx

Push-Pull

662A

xx

G670L263TD5U

Push-Pull

Note: TD: TO-92

Not all product options are ready for mass production, please contact factory for availability.

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

3

Global Mixed-mode Technology Inc.

G670/G671

Selector Guide

TOP MARK

SOT-89

RESET

THRESHOLD (V)

ORDER NUMBER

(Pb free)

OUTPUT TYPE

ORDER NUMBER

663G

xx

G671L463T25U

G671L438T25U

G671L400T25U

G671L330T25U

G671L308T25U

G671L293T25U

G671L263T25U

G670H463T25U

G670H438T25U

G670H400T25U

G670H330T25U

G670H308T25U

G670H293T25U

G670H263T25U

G670L463T25U

G670L438T25U

G670L400T25U

G670L330T25U

G670L308T25U

G670L293T25U

G671L463T25Uf

G671L438T25Uf

G671L400T25Uf

G671L330T25Uf

G671L308T25Uf

G671L293T25Uf

G671L263T25Uf

G670H463T25Uf

G670H438T25Uf

G670H400T25Uf

G670H330T25Uf

G670H308T25Uf

G670H293T25Uf

G670H263T25Uf

G670L463T25Uf

G670L438T25Uf

G670L400T25Uf

G670L330T25Uf

G670L308T25Uf

G670L293T25Uf

G670L263T25Uf

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

Open-Drain

663F

xx

663E

xx

Open-Drain

663D

xx

Open-Drain

663C

xx

Open-Drain

663B

xx

Open-Drain

662A

xx

Open-Drain

662N

xx

Push-Pull RESET

Push-Pull

662M

xx

662L

xx

662K

xx

662J

xx

662I

xx

662H

xx

662G

xx

662F

xx

Push-Pull

662E

xx

Push-Pull

662D

xx

Push-Pull

662C

xx

Push-Pull

662B

xx

Push-Pull

662A

xx

G670L263T25U

Push-Pull

Note: T2: SOT-89

Not all product options are ready for mass production, please contact factory for availability.

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

4

Global Mixed-mode Technology Inc.

G670/G671

Selector Guide

TOP MARK

RESET

THRESHOLD (V)

ORDER NUMBER

(Pb free)

OUTPUT TYPE

ORDER NUMBER

SOT-23

669Gx

669Fx

669Ex

669Dx

669Cx

669Bx

669Ax

668Nx

668Mx

668Lx

668Kx

668Jx

668Ix

G671L463T71U

G671L438T71U

G671L400T71U

G671L330T71U

G671L308T71U

G671L293T71U

G671L263T71U

G670H463T71U

G670H438T71U

G670H400T71U

G670H330T71U

G670H308T71U

G670H293T71U

G670H263T71U

G670L463T71U

G670L438T71U

G670L400T71U

G670L330T71U

G670L308T71U

G670L293T71U

G670L263T71U

Note: T7: SOT-23

G671L463T71Uf

G671L438T71Uf

G671L400T71Uf

G671L330T71Uf

G671L308T71Uf

G671L293T71Uf

G671L263T71Uf

G670H463T71Uf

G670H438T71Uf

G670H400T71Uf

G670H330T71Uf

G670H308T71Uf

G670H293T71Uf

G670H263T71Uf

G670L463T71Uf

G670L438T71Uf

G670L400T71Uf

G670L330T71Uf

G670L308T71Uf

G670L293T71Uf

G670L263T71Uf

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

Open-Drain

Push-Pull RESET

Push-Pull

668Hx

668Gx

668Fx

668Ex

668Dx

668Cx

668Bx

668Ax

Push-Pull

Not all product options are ready for mass production, please contact factory for availability.

Selector Guide

TOP MARK

SOT-23

667Gx

667Fx

667Ex

667Dx

667Cx

667Bx

667Ax

666Nx

666Mx

666Lx

RESET

THRESHOLD (V)

ORDER NUMBER

(Pb free)

OUTPUT TYPE

ORDER NUMBER

G671L463T72U

G671L438T72U

G671L400T72U

G671L330T72U

G671L308T72U

G671L293T72U

G671L263T72U

G670H463T72U

G670H438T72U

G670H400T72U

G670H330T72U

G670H308T72U

G670H293T72U

G670H263T72U

G670L463T72U

G670L438T72U

G670L400T72U

G670L330T72U

G670L308T72U

G670L293T72U

G670L263T72U

Note: T7: SOT-23

G671L463T72Uf

G671L438T72Uf

G671L400T72Uf

G671L330T72Uf

G671L308T72Uf

G671L293T72Uf

G671L263T72Uf

G670H463T72Uf

G670H438T72Uf

G670H400T72Uf

G670H330T72Uf

G670H308T72Uf

G670H293T72Uf

G670H263T72Uf

G670L463T72Uf

G670L438T72Uf

G670L400T72Uf

G670L330T72Uf

G670L308T72Uf

G670L293T72Uf

G670L263T72Uf

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

Open-Drain

Push-Pull RESET

Push-Pull

666Kx

666Jx

666Ix

666Hx

666Gx

666Fx

666Ex

666Dx

666Cx

666Bx

666Ax

Push-Pull

Not all product options are ready for mass production, please contact factory for availability.

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

5

Global Mixed-mode Technology Inc.

G670/G671

Selector Guide

TOP MARK

RESET

THRESHOLD (V)

ORDER NUMBER

(Pb free)

OUTPUT TYPE

ORDER NUMBER

SOT-23

671Gx

671Fx

671Ex

671Dx

671Cx

671Bx

671Ax

670Nx

670Mx

670Lx

670Kx

670Jx

670Ix

G671L463T73U

G671L438T73U

G671L400T73U

G671L330T73U

G671L308T73U

G671L293T73U

G671L263T73U

G670H463T73U

G670H438T73U

G670H400T73U

G670H330T73U

G670H308T73U

G670H293T73U

G670H263T73U

G670L463T73U

G670L438T73U

G670L400T73U

G670L330T73U

G670L308T73U

G670L293T73U

G670L263T73U

Note: T7: SOT-23

G671L463T73Uf

G671L438T73Uf

G671L400T73Uf

G671L330T73Uf

G671L308T73Uf

G671L293T73Uf

G671L263T73Uf

G670H463T73Uf

G670H438T73Uf

G670H400T73Uf

G670H330T73Uf

G670H308T73Uf

G670H293T73Uf

G670H263T73Uf

G670L463T73Uf

G670L438T73Uf

G670L400T73Uf

G670L330T73Uf

G670L308T73Uf

G670L293T73Uf

G670L263T73Uf

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

Open-Drain

Push-Pull RESET

Push-Pull

670Hx

670Gx

670Fx

670Ex

670Dx

670Cx

670Bx

670Ax

Push-Pull

Not all product options are ready for mass production, please contact factory for availability.

Selector Guide

TOP MARK

SOT-23

665Gx

665Fx

665Ex

665Dx

665Cx

665Bx

665Ax

664Nx

664Mx

664Lx

RESET

THRESHOLD (V)

ORDER NUMBER

(Pb free)

OUTPUT TYPE

ORDER NUMBER

G671L463T76U

G671L438T76U

G671L400T76U

G671L330T76U

G671L308T76U

G671L293T76U

G671L263T76U

G670H463T76U

G670H438T76U

G670H400T76U

G670H330T76U

G670H308T76U

G670H293T76U

G670H263T76U

G670L463T76U

G670L438T76U

G670L400T76U

G670L330T76U

G670L308T76U

G670L293T76U

G670L263T76U

Note: T7: SOT-23

G671L463T76Uf

G671L438T76Uf

G671L400T76Uf

G671L330T76Uf

G671L308T76Uf

G671L293T76Uf

G671L263T76Uf

G670H463T76Uf

G670H438T76Uf

G670H400T76Uf

G670H330T76Uf

G670H308T76Uf

G670H293T76Uf

G670H263T76Uf

G670L463T76Uf

G670L438T76Uf

G670L400T76Uf

G670L330T76Uf

G670L308T76Uf

G670L293T76Uf

G670L263T76Uf

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

4.60

4.32

3.96

3.30

3.10

2.91

2.64

Open-Drain

Push-Pull RESET

Push-Pull

664Kx

664Jx

664Ix

664Hx

664Gx

664Fx

664Ex

664Dx

664Cx

664Bx

664Ax

Push-Pull

Not all product options are ready for mass production, please contact factory for availability.

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

6

Global Mixed-mode Technology Inc.

G670/G671

Absolute Maximum Ratings

Terminal Voltage (with respect to GND)

Continuous Power Dissipation (T_A= +70°C)

V_CC.……………………………..……….….-0.3V to +6.0V

SOT-23 (derate 4mW/°C above +70°C)………..100mW

SOT-89 (derate 4mW/°C above +70°C)………..100mW

TO-92 (derate 4mW/°C above +70°C)………….100mW

Operating Temperature Range …........-40°C to +105°C

Storage Temperature Range..….….….-65°C to +150°C

Reflow Temperature (soldering, 10sec)……......+260°C

RESET,RESET (push-pull)....…....-0.3V to (V_CC+ 0.3V)

RESET (open drain)...…..............…........-0.3V to +6.0V

Input Current, V_CC............................….................20mA

Output Current, RESET, RESET ........................20mA

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the

specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Electrical Characteristics

(V_CC= full range, T_A= -40°C to +105°C, unless otherwise noted. Typical values are at T_A= +25°C, V_CC= 5V

for 463/438/400/330 versions, V_CC= 3.3V for 308/293 versions, and V_CC= 3V for 263 version.) (Note 1)

PARAMETER

V_CCRange

SYMBOL

CONDITION

MIN TYP MAX UNIT

T_A= 0°C +70°C

1.0

1.2

---

5.5

V

T_A= -40°C +105°C

V_CC<5.5V, G67_

_463/438/400/330_

---

16.5

25

Supply Current

I_CC

T_A= -40°C +105°C

µA

V_CC<3.6V, G67_ _308/293/263_

G67_ _463_

---

13.9

22

4.50 4.60

4.23 4.32

3.88 3.96

3.24 3.30

4.69

4.40

4.04

3.37

G67_ _438_

G67_ _400_

Reset Threshold

V_TH

T_A= +25°C

V

G67_ _330_

G67_ _308_

3.04 3.10 3.16

2.86 2.91 2.96

2.59 2.64 2.69

3.60 5.30 7.00

G67_ _293_

G67_ _263_

Reset Threshold Hysterisis

Reset Threshold Tempco

V_HYST

%

ppm/°

C

---

40

---

V_CCto Reset Delay (Note 2)

Reset Active Timeout Period

V_CC= V_THto (V_TH– 100mV)

V_CC= V_THmax,

---

7

---

2

µs

---

ms

RESET Output Current Low

(push-pull active low,and

open-drain active-low, G670L

and G671L)

V_CC= 2.5V, V RESET = 0.5V

I_OL

8

---

mA

V_CC= 5V, V RESET = 4.5V, G670L463/438/400/330

V_CC= 3.3V, V RESET = 2.8V,G670L308/293

4.5

3

---

RESET Output Current High

(push-pull active low, G670L)

I_OH

mA

V

_CC= 3V, V RESET = 2.5V, G670L263

2

V_CC= 5V, V_RESET= 0.5V, G670H463/438/400/330

V_CC= 3.3V, V_RESET= 0.5V, G670H308/293

V_CC= 3V, V_RESET= 0.5V, G670H263

16

12

10

RESET Output Current Low

(push-pull active high, G670H)

I_OL

RESET Output Current High

(push-pull active high, G670H)

I_OH

V_CC= 2.5V, V_RESET= 2V

2

---

1

mA

µA

RESET Open-Drain Output

Leakage Current (G671L)

---

V_CC> V_TH, RESET deasserted

Note 1: Production testing done at T_A= +25°C; limits over temperature guaranteed by design.

Note 2:RESET output is for G670L/G671L; While RESET output is for G670H.

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

7

Global Mixed-mode Technology Inc.

G670/G671

Typical Operating Characteristics

(V_CC= full range, T_A= -40°C to +105°C, unless otherwise noted. Typical values are at T_A= +25°C, V_CC= 5V

for 463/438/400 versions, V_CC= 3.3V for 308/293 versions, and V_CC= 3V for 263 version.)

Power-down Reset Delay vs.

Temperature (G67_ _463/438/400/330)

Supply Current vs.Temperature

(No Load)

140

120

100

80

20

15

10

5

V_OD= V_TH- V_CC

G67_ _ 463/438/400/330, V_CC= 5V

V_OD= 10mV

V_OD= 20mV

G67_ _ 308/293/263, V_CC= 3.3V

60

40

G67_ _ 463/438/400/330/308/293/263, V_CC=1V

V_OD= 100mV

20

0

-40

-20

0

20

40

60

80

-40

-20

0

20

40

60

80

Temperature (°C)

Normalized Reset Threshold

vs. Temperature

Power-down Reset Delay vs.

Temperature (G67_ _308/293/263)

1.002

1

70

60

50

40

30

20

10

0

V_OD= V_TH- V_CC

0.998

0.996

0.994

0.992

0.99

V_OD= 10mV

V_OD= 20mV

V_OD=100mV

V_OD=200mV

0.988

-40

-20

0

20

40

60

80

-40

-20

0

20

40

60

80

Temperature (°C)

Recommended Minimum Footprint

SOT-23

SOT-89

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

8

Global Mixed-mode Technology Inc.

G670/G671

Pin Description

NAME

FUNCTION

GND

Ground

RESET Output remains low while V_CCis below the reset threshold, and for at most 2ms after V_CCrises

above the reset threshold.

(G671L/G670L)

RESET

(G670H)

RESET Output remains high while V_CCis below the reset threshold, and for at most 2ms after V_CCrises

above the reset threshold.

VCC

Supply Voltage (+5V, +3.3V, +3.0V)

Detailed Description

Applications Information

A microprocessor’s (µP’s) reset input starts the µP in a

known state. The G671L/G670L/G670H assert reset to

prevent code-execution errors during power-up,

power-down, or brownout conditions. They assert a

reset signal whenever the V_CCsupply voltage declines

below a preset threshold, keeping it asserted for at

most 2ms after V_CChas risen above the reset thresh-

old. The G671L uses an open-drain output, and the

G670L/G670H have a push-pull output stage. Connect

Negative-Going V_CCTransients

In addition to issuing a reset to the µP during power-up,

power-down,

and

brownout

conditions,

the

G671L/G670H/G670L are relatively immune to short-

duration negative-going V_CCtransients (glitches).

Figure 1 shows typical transient duration vs. reset

comparator overdrive, for which the G671L/G670H/

G670L do not generate a reset pulse. The graph was

generated using a negative-going pulse applied to V_CC,

starting 0.5V above the actual reset threshold and

ending below it by the magnitude indicated (reset

comparator overdrive). The graph indicates the maxi-

mum pulse width a negative-going V_CCtransient can

have without causing a reset pulse. As the magnitude

of the transient increases (goes farther below the reset

threshold), the maximum allowable pulse width de-

creases. Typically, for the G67_ _463 and G67_ _438,

a V_CCtransient that goes 100mV below the reset

threshold and lasts 7µs or less will not cause a reset

pulse. A 0.1µF bypass capacitor mounted as close as

possible to the V_CCpin provides additional transient

immunity.

a pull-up resistor on the G671L’s RESET output to any

supply between 0 and 5.5V.

600

500

400

300

G67_ _ 463/438/400

200

100

Ensuring a Valid Reset Output Down to V_CC= 0

G67_ _ 308/293/263

0

When V_CCfalls below 1V, the G670 RESET output

no longer sinks current—it becomes an open circuit.

Therefore, high-impedance CMOS logic inputs con-

1

10

100

1000

Reset Comparator Overdrive, V_TH- V_CC(mV)

Figure 1. Maximum Transient Duration Without

Causing a Reset Pulse vs. Reset Com-

parator Overdrive

nected to RESET can drift to undetermined voltages.

This presents no problem in most applications since

most µP and other circuitry is inoperative with VCC

below 1V. However, in applications where RESET

must be valid down to 0V, adding a pull-down resistor

to RESET causes any stray leakage currents to flow

V_CC

to ground, holding RESET low (Figure 2). R1’s value

is not critical; 100kΩ is large enough not to load

RESET and small enough to pull RESET to ground.

G670

RESET

A 100kΩ pull-up resistor to VCC is also recommended

for the G671L if RESET is required to remain valid

for V_CC< 1V.

R1

100k

GND

Figure 2. RESET Valid to V_CC= Ground Circuit

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

9

Global Mixed-mode Technology Inc.

G670/G671

Interfacing to µPs with Bidirectional Reset Pins

V_CC

Since the RESET output on the G671L is open drain,

this device interfaces easily with µPs that have bidirec-

tional reset pins, such as the Motorola 68HC11. Con-

V_CC

R_PULL-UP

necting the µP supervisor’s RESET output directly to

µP

G671

the microcontroller’s (µC’s) RESET pin with a single

pull-up resistor allows either device to assert reset

(Figure 3).

RESET MOTOROLA

RESET

INPUT

68HCXX

GND

G671L Open-Drain RESET Output Allows Use with

Multiple Supplies

Generally, the pull-up connected to the G671L will

connect to the supply voltage that is being monitored

at the IC’s V_CCpin. However, some systems may use

the open-drain output to level-shift from the monitored

supply to reset circuitry powered by some other supply

(Figure 4). Note that as the G671L’s V_CCdecreases

below 1V, so does the IC’s ability to sink current at

Figure 3. Interfacing to µPs with Bidirectional Re-

set

I/O

+5.0V

+3.3V

RESET . Also, with any pull-up, RESET will be pulled

high as VCC decays toward 0. The voltage where this

occurs depends on the pull-up resistor value and the

voltage to which it is connected.

V_CC

R_PULL-UP

5V SYSTEM

G671

RESET

INPUT

RESET

Benefits of Highly Accurate Reset Threshold

Most µP supervisor ICs have reset threshold voltages

between 5% and 10% below the value of nominal

supply voltages. This ensures a reset will not occur

within 5% of the nominal supply, but will occur when

the supply is 10% below nominal.

GND

When using ICs rated at only the nominal supply ±5%,

this leaves a zone of uncertainty where the supply is

between 5% and 10% low, and where the reset may or

may not be asserted.

Figure 4. G671L Open-Drain RESET Output Allows

Use with Multiple Supplies

The G67_ _463/G67_ _308 use highly accurate circuitry

to ensure that reset is asserted close to the 5% limit,

and long before the supply has declined to 10% below

nominal.

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

10

Global Mixed-mode Technology Inc.

G670/G671

Package Information

L

b

E

e

D

A

C

A1

D1

G

TO-92 (TD) Package

MILLIMETER

INCH

MAX

0.152

0.061

0.020

0.191

0.020

0.592

0.055

0.165

0.189

0.191

SYMBOL

MIN

3.35

MAX

3.86

MIN

0.132

0.041

0.010

0.171

0.010

0.572

0.045

0.145

0.169

0.171

A

A1

b

1.0414

0.254

4.34

1.55

0.508

4.85

E

C

0.254

14.53

1.143

3.683

4.29

0.508

15.04

1.397

4.191

4.80

L

e

G

D

D1

4.34

4.85

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

11

Global Mixed-mode Technology Inc.

G670/G671

D

D1

POLISH

E

HE

A1

e

C

MATTE FINISH

A

b

b1

POLISH

b

SOT-89 (T2) Package

DIMENSIONS IN MILLIMETER

DIMENSIONS IN INCH

SYMBOL

MIN

NOM

1.50

1.04

0.42

0.47

0.40

4.50

1.60

-----

MAX

MIN

0.055

0.031

0.014

0.016

0.014

0.173

0.055

-----

NOM

0.059

0.041

0.016

0.018

0.015

0.177

0.062

-----

MAX

0.063

-----

A

A1

b

1.40

0.80

0.36

0.41

038

1.60

-----

0.48

0.53

0.43

4.60

1.75

4.25

2.60

3.10

0.018

0.020

0.017

0.181

0.069

0.167

0.102

0.122

b1

C

D

4.40

1.40

-----

D1

HE

E

2.40

2.90

2.50

3.00

0.094

0.114

0.098

0.118

e

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

12

Global Mixed-mode Technology Inc.

G670/G671

Package Information

C

D

L

E

H

e

θ1

A

A2

A1

b

SOT-23 (T7) Package

Note:

1.Package body sizes exclude mold flash protrusions or gate burrs

2.Tolerance ±0.1000 mm (4mil) unless otherwise specified

3.Coplanarity: 0.1000mm

4.Dimension L is measured in gage plane

DIMENSIONS IN MILLIMETER

SYMBOL

MIN

1.00

0.00

0.70

0.35

0.10

2.70

1.40

-----

NOM

1.10

MAX

1.30

0.10

0.90

0.50

0.25

3.10

1.80

-----

A

A1

A2

b

-----

0.80

0.40

C

0.15

D

2.90

E

1.60

e

1.90(TYP)

2.80

H

2.60

0.37

1º

3.00

-----

L

------

θ1

5º

9º

Taping Specification

PACKAGE

TO-92

Q’TY/REEL

-----

Q’TY/BY BAG

2,000 ea

-----

SOT-89

SOT-23

1,000 ea

3,000 ea

Feed Direction

SOT-23 Package Orientation

SOT-89 Package Orientation

GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Dec 03, 2005

13


型号：	G670L308T25U
厂家：	GLOBAL MIXED-MODE TECHNOLOGY INC
描述：	Power Management Circuit
文件：	总13页 (文件大小：165K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

G670L308T25U [GMT]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E